#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define MAXLINE 256
int main(int argc, char** argv)
{
    int socketfd, n;
    char recvline[MAXLINE+1];
    struct sockaddr_in servaddr;
    if(argc != 2)
    {  
        printf("usage:a.out<IP address>/n");
        exit(-1);
    }   
    if((socketfd=socket(AF_INET, SOCK_STREAM, 0)) < 0)
    {
        printf("socket err/n");
        exit(-1);
    }  
    bzero(&servaddr, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_port = htons(13);
    if(inet_pton(AF_INET, argv[1], &servaddr.sin_addr) <= 0)
    {
        printf("inet_pton error for %s/n", argv[1]);
        exit(-1);
    } 
 if(connect(socketfd, (struct sockaddr*)&servaddr, sizeof(servaddr)) < 0)
 {
        printf("connect error/n");
        exit(-1);
    } 
 while((n=read(socketfd, recvline, MAXLINE))>0)
 {
  recvline[n] = 0;
  if(fputs(recvline, stdout) == EOF)
  {
         printf("fputs error/n");
         exit(-1);
     } 
 }
 if(n<0)
 {
        printf("read error/n");
        exit(-1);
    }
 exit(0); 
}
